Down The Rabbit Hole: Quantum Physics Lesson 8. Objectives Define a quantum Calculate the energy of...
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Down The Rabbit Hole: Quantum Physics
Lesson 8
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Objectives
• Define a quantum • Calculate the energy of a photon • Relate photon energy to wavelength and
frequency of EMR
Objectives
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Blackbody Radiation
• Stove burner
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Blackbody Radiation
• It was known that as one heats an object it changes color. What colors can you name as objects heat up?
• The color corresponds to the emission of EMR. As the object gets hotter it should emit greater and greater frequencies of EMR.
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Predicted Wavelengths
• It was predicted that an ideal blackbody at thermal equilibrium will emit EMR with infinite power under classical physics
• However, blackbodies only emit wavelengths of certain color when at certain temperatures as shown by the graph on the next page
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Predicted vs. Actual Blackbody Radiation
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• Since values above the visible light region did not occur in increasing amounts as predicted, scientists were at a loss to explain the results and called this the Ultraviolet Catastrophe.
Ultraviolet Catastrophe
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• Max Planck resolved this issue by postulating that electromagnetic energy did not follow the classical description
• Planck assumed that the energy given off by these objects had to occur in discreet units (bundles) of energy. Each of these bundles had a specific quantity of energy associated with it. He called these units Quanta.
Max Planck
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• 1. How much energy does a photon (quantum) with a frequency of 2.00 x 1014 Hz have in J and eV?
• 2. What is the wavelength of a photon having 5.97 x 10-15 J of energy? What part of the EMR spectrum is this?
• 3. How many photons are given off each second by a green (λ = 555 nm) 60.0 Watt light bulb?
Examples